Fixed rt 77283. If you overrode the bind type as SQL_INTEGER in a bind_col
call AFTER previously binding as another type (or not specifying a type)
you would not get the right value back. This also fixes the DiscardString
bind_col attribute for SQL_INTEGER binds (however, see below as DiscardString
is no longer required for SQL_INTEGER).

Fixed some format specifiers in trace calls.

[CHANGE IN BEHAVIOUR]

DBD::ODBC allowed you to change the bound column type in bind_col
after the column was already bound. It now does not allow this
and issues a warning.

You can nolonger override the bound column type (except with
SQL_NUMERIC and SQL_DOUBLE). All columns are now bound as either
SQL_C_LONG (integer columns) or SQL_C_[W]CHAR (all other columns).
If you are calling bind_col with a TYPE => xxx it most likely did
not do what you expected and you should examine it carefully with a
view to removing it altogether. As a result you no longer have to
override the bind type for MS SQL Server XML columns - these will be
bound as SQL_C_CHAR or SQL_C_WCHAR depending on whether Unicode is
enabled.

Integer columns are now bound as SQL_C_LONGs and not as before,
SQL_C_CHAR. This should not matter to you but if you were adding 0
to your integer columns retrieved to make them behave like integers
you should nolonger need to do it.

[OTHER]

Added some missing SQL_C_xxx types to S_SqlCTypeToString internal
function. This only affects tracing.